package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.SystemConstants;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.USER_SIGN_KEY;
import static com.hmdp.utils.SystemConstants.*;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(HttpSession session, String phone) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            //2.如果不符合,返回错误信息
            return Result.fail("无效手机号!");
        }
        //3.生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到Redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        session.setAttribute("code",code);
        //5.发送验证码
        log.debug("发送验证码成功,验证码为:{}",code);
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            //2.如果不符合,返回错误信息
            return Result.fail("无效手机号!");
        }
        //3.从redis获取验证码并校验验
        String cachaCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cachaCode == null || !cachaCode.equals(code)){
            //4.不一致，报错
            return Result.fail("验证码校验错误");
        }
        //5.一致，根据手机号查询用户
        User user = query().eq("phone",phone).one();
        //6.判断用户是否存在
        if (user  == null){
            //7.不存在,创建新用户并保存
            user = createUserWithPhone(phone);
        }
        //8.保存用户信息于redis
        //8.1随机生成token
        String token = UUID.randomUUID().toString(true);
        //8.2将User对象转为Hash存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> stringObjectMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        //.setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()
                        .setFieldValueEditor((fieldName,fieldValue) -> {
                            if (fieldValue == null){
                                fieldValue = "0";
                            }else {
                                fieldValue = fieldValue + "";
                            }
                            return fieldValue;
                        }));
        //8.3存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,stringObjectMap);
        //8.4设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //9.返回token到客户端
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyMM"));
        //3.拼接key
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis SETBIT key offset 1
        stringRedisTemplate.opsForValue().setBit(key,(dayOfMonth - 1),true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1.获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyMM"));
        //3.拼接key
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月截至今天为止的所有的签到记录，返回的是一个十进制的数字 BITFILED sign:1:2370 GET u29 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth))
                        .valueAt(0L)
        );
        if (result == null || result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == 0 || num == null){
            return Result.ok(0);
        }
        //6.循环遍历
        int count = 0;
        while (true){
            //6.1.让这个数字与1 做与运算，得到数字的最后一个bit数字
            //6.2.判断这个bit位是否为0
            if ((num & 1) == 0){
                //6.3.如果为0，说明未签到，结束
                break;
            }
            else {
                //6.4.如果不为0，说明已签到，计数器+1，并右移一位
                count ++;
            }
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone){
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        //2.将用户插入数据库
        save(user);
        return user;
    }
}
